AT&T DS1/DMi/ISDN-PRI manual Mpdm, Ncte

GL-14	GLOSSARY
MEGACOM ®		AT&T’s tariffed digital 800-service offering for inward calling.
800
misframe		A condition that results when the receive endpoint fails to receive the correct
		framing pattern.
MO		See maintenance object.
mode 3		A data-communications protocol consisting of the International Standards
		Organization (ISO) link-access procedure on the D-channel (LAPD) at level 2
		and the X.25 packet-layer procedure at level 3.
modem		A device that converts digital data signals to analog signals for transmission over
		telephone circuits. The analog signals are converted back to the original digital
		data signals by another modem at the other end of the circuit. Also called a data
		set.
modem pooling		A capability that provides shared conversion resources (modems and data
		modules) for cost-effective access to analog facilities by data terminals. When
		needed, modem pooling inserts a conversion resource into the path of a data call.
		Modem pooling serves both outgoing and incoming calls.
modular		A processor data module (PDM) that can be configured to provide several kinds
processor data		of interfaces (RS-232C, RS-449, and V.35) to customer-provided data terminal
module		equipment (DTE). See also processor data module.
(MPDM)
MPDM		See modular processor data module.
multiplexer		A device used to combine a number of individual channels into a common bit
		stream for transmission.
NCTE		See network channel-terminating equipment.
network		Equipment used at a customer’s premises to provide facility terminations and
channel-		signaling compatibility. Also called channel-service unit and customer-service
terminating		unit. See also data service unit.
equipment
(NCTE)
network feature		See network service.
network		See ISDN network identifier.
identifier
network service		A number or value that is used on most ISDN outgoing calls to place a specific
		request on the network communications system. Also called network feature.
network side		See user side.
network-specific		An information element (IE) in an Integrated Services Digital Network primary
facilities (NSF)		rate interface (ISDN-PRI) message that specifies which public-network service is
		used. NSF applies only when Call-by-Call (CBC) Service Selection is used to
		access a public-network service, such as MEGACOM® , MEGACOM® 800, and
		the Software-Defined Network (SDN).